Collapsing Links Wordpress Plugin is used by 16 websites. Among 16, 0 site is within top 10,000 and 1 site is within top 100,000 websites.
Wordpress Plugin Information of
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You can use multiple instances of the widget, each with its own set of options. In this way you could have one set of links for certain categories one place on your page, and another widget with a different set of links somewhere else.
It is based off of the Collapsing Categories and Collapsing Pages plugins.
Wordpress Official Plugin Repository